28913565 ÷ 816 
The aim is to understand the frequency of 816 in 28913565.

On to step 1:
The number 816 fits into 2 0 times, leaving a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Bring next digit (8) of the dividend behind the 2 and repeat the process: 28 / 816

Going ahead to step 2:
The number 816 fits into 28 0 times, leaving a remainder of 28.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 28, we get 28.
Fetch the next digit (9) from the dividend, attach it to 28 and continue: 289 / 816

Step 3:
When dividing 289 by 816, we get 0 with a remainder of 289.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 289 and we're left with 289.
Bring next digit (1) of the dividend behind the 289 and repeat the process: 2891 / 816

Step 4:
816 can be fit into 2891 3 times, resulting in a remainder of 443.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtract 2448 from 2891 to get 443.
Fetch the next digit (3) from the dividend, attach it to 443 and continue: 4433 / 816

Advancing to step 5:
The number 816 fits into 4433 5 times, leaving a remainder of 353.
The next digit of our result is 5. 
Result so far: 35.0
If we take 4080 away from 4433, we end up with 353.
Fetch the next digit (5) from the dividend, attach it to 353 and continue: 3535 / 816

Advancing to step 6:
If we divide 3535 by 816, we get 4 and a remainder of 271.
Record the quotient 4 as the next digit in the result. 
Result so far: 354.0
If we take 3264 away from 3535, we end up with 271.
Grab the next digit (6) from the dividend, add it to 271, then carry on: 2716 / 816

Going ahead to step 7:
If we divide 2716 by 816, we get 3 and a remainder of 268.
The next digit of our result is 3. 
Result so far: 3543.0
If we subtract 2448 from 2716, we get 268.
Include the next digit (5) from the dividend after 268, then repeat: 2685 / 816

Advancing to step 8:
The number 816 fits into 2685 3 times, leaving a remainder of 237.
The number 3 becomes the next digit in our result. 
Result so far: 35433.0
Deduct 2448 from 2685 and we're left with 237.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2370, and continue the process.

Moving on to step 9:
816 goes into 2370 2 times with a remainder of 738.
Use 2 as the next digit of our solution. 
Result so far: 35433.2
Subtracting 1632 from 2370 leaves us with 738.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7380, and continue the process.

Let's proceed to step 10:
816 can be fit into 7380 9 times, resulting in a remainder of 36.
The next digit of our result is 9. 
Result so far: 35433.29
Subtracting 7344 from 7380 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 11:
The number 816 fits into 360 0 times, leaving a remainder of 360.
The number 0 becomes the next digit in our result. 
Result so far: 35433.29
Deduct 0 from 360 and we're left with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Going ahead to step 12:
816 goes into 3600 4 times with a remainder of 336.
Write down 4 as next digit of the result. 
Result so far: 35433.2904
Subtract 3264 from 3600 to get 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

Step 13:
3360 divided by 816 is 4 with a remainder of 96.
The number 4 becomes the next digit in our result. 
Result so far: 35433.29044
Deduct 3264 from 3360 and we're left with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

The final outcome is 35433.29044, with a leftover of 9.6e-05.